1860s-1890s?
Origination : University of Notre Dame. Archives.Collected by the Archives of the University of Notre Dame.
Tintypes Collection (TTS), University of Notre Dame Archives (UNDA), Notre Dame, IN 46556
Tintypes (early photographs).
"A tintype, also known as a melainotype or ferrotype, is a photograph made by creating a direct positive on a thin sheet of iron coated with a dark lacquer or enamel and used as the support for the photographic emulsion. Tintypes enjoyed their widest use during the 1860s and 1870s, but lesser use of the medium persisted into the early 20th century and it has been revived as a novelty in the 21st." -- Wikipedia